What is Z score of coronary artery?

Classification Size of coronary artery abnormality*
Dilation only Z-score 2 to <2.5 or if initially <2, a ≥1 decrease in Z-score during follow-up¶
Small aneurysm Z-score ≥2.5 to <5
Medium aneurysm Z-score of ≥5 to <10 and absolute dimension <8 mm
Large aneurysm or giant aneurysm Z-score ≥10 or absolute dimension ≥8 mm

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